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Magnetic moment generation in small gold nanoparticles via the plasmonic inverse Faraday effect
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.ORCID iD: 0000-0002-9069-2631
Univ Strasbourg, CNRS, Inst Phys & Chim Mat Strasbourg, UMR 7504, F-67000 Strasbourg, France.
Univ Strasbourg, CNRS, Inst Phys & Chim Mat Strasbourg, UMR 7504, F-67000 Strasbourg, France.
2018 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 98, no 13, article id 134439Article in journal (Refereed) Published
Abstract [en]

We theoretically investigate the creation of a magnetic moment in gold nanoparticles by circularly polarized laser light. To this end, we describe the collective electron dynamics in gold nanoparticles using a semiclassical approach based on a quantum hydrodynamic model that incorporates the principal quantum many-body and nonlocal effects, such as the electron spill-out, the Hartree potential, and the exchange and correlation effects. We use a variational approach to investigate the breathing and the dipole dynamics induced by an external electric field. We show that gold nanoparticles can build up a static magnetic moment through the interaction with a circularly polarized laser light at the localized surface plasmon (LSP) resonance. We analyze that the responsible physical mechanism is a plasmonic, orbital inverse Faraday effect, which can be understood from the time-averaged electron current that contains currents rotating on the nanoparticle's surface. The computed laser-induced magnetic moments are sizable, of about 0.35 p. B /atom for a laser intensity of 45 x 10(10) W/cm(2) at LSP resonance.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2018. Vol. 98, no 13, article id 134439
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-369905DOI: 10.1103/PhysRevB.98.134439ISI: 000448046900002OAI: oai:DiVA.org:uu-369905DiVA, id: diva2:1272177
Funder
Knut and Alice Wallenberg Foundation, 2015.0060Swedish Research CouncilSwedish National Infrastructure for Computing (SNIC)EU, Horizon 2020, 737709Available from: 2018-12-18 Created: 2018-12-18 Last updated: 2018-12-18Bibliographically approved

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Hurst, JeromeOppeneer, Peter M.

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